Roof-framing tool.



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UNITED STATES EZRA G. PETTIT, OF MARIETTA, OHIO.

ROOF-FRAMING TOOL.

SPECIFICATION forming part of letters Patent No. 695,339, dated March 1 1, 1902.

Application filed May 21,1901.

T0 @ZZ whom, it may concern:

Be it known that I, FZRA G. PETTIT, a citizen of the United States, residing at Marietta, in the county of Washington and State of Ohio, have invented new and useful Improvements in Roof-Framing Tools, of which the following is a specification.

This invention relates to new and useful improvements in roof-framing tools; and its primary object is to provide a device of simple construction whereby the rafters which compose the frame of a roof may be marked upon their faces and edges, so as to secure the proper bevels for the different styles of rafters employed.

l Another object is to so construct the tool that the same may be set after having been adjusted to the proper angles.

With these and other objects in view the invention consists in providing two arms, which are hinged together at their adjacent ends and the opposite ends of which are connected by means of an adjustable rod provided with suitable graduations whereby the angle at which the arms are placed to each other is readily indicated.

The invention also consists in providing extensions which are hinged to the free ends of the arms at right angles thereto and which are adapted to overlap the edges of the rafters, upon which are placed the arms above These extensions are also connected by an adjustable rod bearing suitable graduations and whereby the angle to be marked upon the edge of the rafter may be readily determined.

y The invention also consists in certain novel features of construction and combination of parts,whichwillbe hereinafterfully described and claimed, and illustrated in the accompanying drawings,-showing the preferred form of my invention, and in whichl Figure 1 is a perspective view of the device in position upon a beam or rafter. Fig. 2 is a sectional detail view of one of the arms and its extension.

l and 2 designate a pair of flat bars pivoted at their ends to form a hingejoint 3. Intermediate the ends of the bar 1 is pivoted a tube 4, carrying a set-screw 5 and in which is slidably secured a graduated bar 6, secured to the bar 2 and in connection with the tube Serial No. 61,243. (No model.)

4, forming an adjusting means for spacing the above-mentioned bars apart. To the free ends of the respective bars I pivot plates 7 and 8, connected to the same by the rightangular flanges 9 and pivots 10, these plates being adapted to hang over the rafter or ridgebeam, as will be presently explained. j

Pivoted to the under side of the plates 7 and 8 are graduated secondary plates 11 and 12, provided with a centrally-located upwardly-projecting pins or bolts 13 and 14, which work in segmental slots 15 and 16 in the plates 7 and 8. These bolts carry, respectively, a hollow tubel and a graduatingbar (designated by the reference-numerals 17 and 18) similar to the ones heretofore described and are for the purpose of spacing the plates apart. The set-screw is utilized for holding the spacing medium in a predetermined adjustment. The tube and rod are held in position with relation to the bolts 13 and 14 through the medium of thumb-nuts 19 and 20.

It will be noticed that the outer edges of the respective plates are cut on an angle to the longitudinal edges thereof and with the graduations or scale on the secondary plaies are arranged so as to comprise a plurality of diverging lines which register with the outer edge, so as to throw the edges of the secondary plates at varying angles with relation to the plates 7 and 8, so as to provide for a different miter on the beam to be cut. The vertically-extending bars 1 and 2 can also be adjusted to conform to the top cut made in accordance with the adjusting or secondary plates, or they may be arranged so as to guide the saw at an entirely diiferent angle thereto.

It will be seen that a device made in accordance with the above will be cheap and durable in construction and that the securing ends of the tube 17 and rod 18 are made flat, so as to form washers constituting bearings to rest between the plates 7 and 8 of the thumb-nuts 19 and 20. By use of a device of this character the beam may be cut at any desired angle without the necessity of any other tools, and so, while -I have described in detail what to me at this time appears to be the very best means of accomplishing the desired result, I would have it understood that I do not limit myself to the exact details of IOO . make slight changes and alterations as might suggest themselves from time to time Without departing from the spirit of my invention.

Having thus described the invention, what is claimed, and desired to be secured by Letters Patent, is

1. The combination of arms having right` angle extensions and hinged at their adjacent ends, a tube pivoted at one end directly to one arm and having its other end extending toward the other arm, a rod having graduations and pivoted at one end directly to the last-named arm and having its other end extending toward the first-named arm and fitted to the tube, means located on the tube for binding the tube and rod to their adjustment. l p

2. The combination with arms hinged at their adjacent ends; of a right-angle extension hinged to the free end of each arm, means for adjusting the arms from or toward each other, and means for adjusting the angles of the extensions to each other independently of the arms.

3. The combination With arms hinged at their adjacent ends; of means for adjusting said arms from or toward each other, a plate hinged to the free end of each arm and arranged in a plane at right angles thereto, a tube pivoted to one of the plates, a rod pivoted to the remaining plate and adapted to extend into the tube, said rod being provided With suitable graduations, and means for binding the rod Within the tube.

4. The combination with arms hinged together at their adjacent ends; of a tube pivoted to one of the arms, agraduated rod pivoted to the remaining arm and adapted to extend into the tube, means for locking the rod Within the tube, a plate hinged tothe free end of each arm and adapted to lie at right angles to the arm, a tube pivoted to one of the plates, a graduated rod pivoted to the remaining plate and adapted to extend into said tube, and means forlocking the rod Within the tube.

5. The combination with arms hinged together at their adjacent ends; of means for adjusting said arms from or toward each other, plates hinged to the ends of the respective arms, of pivoted secondary plates pivoted to the rst-named plates and provided With a plurality of graduations adapted to aline with the edges of the iirst-named plates and means for adjusting the graduated plates With relation thereto.

6. The combination with arms hinged to.- gether at their adjacent ends, of means for `adjusting said arms from and toward each other, of plates pivoted to the free ends of the respective arms, and lie in aplane at right angles thereto, secondary plates hinged to the first-named plates, and having upwardlyprojecting pins Working in slots in said iirstnamed plates, and means attached to said pins for adjusting the secondary plates with relation to the iirst-named plate.

In testimony whereof I afiix my signature in presence of Witnesses.

EZRA G. PETTI'F.

Witnesses:

S. J. HATHAWAY, GEORGE THEIs, FRANK MILLER. 

